<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="utf-8" />
   
  <meta name="keywords" content="Java Python" />
   
  <meta name="description" content="From Zero to Hero" />
  
  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1" />
  <title>
    Spring-01-概述及IOC理论推导 |  朱酱酱的学习博客
  </title>
  <meta name="generator" content="hexo-theme-yilia-plus">
  
  <link rel="shortcut icon" href="/favicon.ico" />
  
  
<link rel="stylesheet" href="/css/style.css">

  
<script src="/js/pace.min.js"></script>


  

  

<link rel="alternate" href="/atom.xml" title="朱酱酱的学习博客" type="application/atom+xml">
</head>

</html>

<body>
  <div id="app">
    <main class="content">
      <section class="outer">
  <article id="post-Spring/Spring-01-概述及IOC理论推导" class="article article-type-post" itemscope
  itemprop="blogPost" data-scroll-reveal>

  <div class="article-inner">
    
    <header class="article-header">
       
<h1 class="article-title sea-center" style="border-left:0" itemprop="name">
  Spring-01-概述及IOC理论推导
</h1>
  

    </header>
    

    
    <div class="article-meta">
      <a href="/2020/05/01/Spring/Spring-01-%E6%A6%82%E8%BF%B0%E5%8F%8AIOC%E7%90%86%E8%AE%BA%E6%8E%A8%E5%AF%BC/" class="article-date">
  <time datetime="2020-05-01T07:02:24.000Z" itemprop="datePublished">2020-05-01</time>
</a>
      
      
      
<div class="word_count">
    <span class="post-time">
        <span class="post-meta-item-icon">
            <i class="ri-quill-pen-line"></i>
            <span class="post-meta-item-text"> 字数统计:</span>
            <span class="post-count">1.9k字</span>
        </span>
    </span>

    <span class="post-time">
        &nbsp; | &nbsp;
        <span class="post-meta-item-icon">
            <i class="ri-book-open-line"></i>
            <span class="post-meta-item-text"> 阅读时长≈</span>
            <span class="post-count">7分钟</span>
        </span>
    </span>
</div>

      
    </div>
    

    
    
    <div class="tocbot"></div>





    

    <div class="article-entry" itemprop="articleBody">
      


      

      
      <h1 id="Spring-01-概述及IOC理论推导"><a href="#Spring-01-概述及IOC理论推导" class="headerlink" title="Spring-01-概述及IOC理论推导"></a>Spring-01-概述及IOC理论推导</h1><h2 id="1-简介"><a href="#1-简介" class="headerlink" title="1. 简介"></a>1. 简介</h2><p><img src="http://zhuuu-bucket.oss-cn-beijing.aliyuncs.com/img/20200508/203155619.png" alt="mark"></p>
<ul>
<li><p>2002年，Rod Jahnson首次推出了<code>Spring</code>框架雏形<code>interface21</code>框架。</p>
</li>
<li><p>2004年3月24日，<strong>Spring框架以interface21框架为基础，经过重新设计，发布了1.0正式版。</strong></p>
</li>
<li><p>很难想象<code>Rod Johnson</code>的学历 , 他是悉尼大学的博士，然而他的专业不是计算机，而是音乐学。</p>
</li>
</ul>
<p><strong>官网</strong> : <a href="http://spring.io/" target="_blank" rel="noopener">http://spring.io/</a></p>
<p><strong>官方下载地址</strong> : <a href="https://repo.spring.io/libs-release-local/org/springframework/spring/" target="_blank" rel="noopener">https://repo.spring.io/libs-release-local/org/springframework/spring/</a></p>
<p><strong>GitHub</strong> : <a href="https://github.com/spring-projects" target="_blank" rel="noopener">https://github.com/spring-projects</a></p>
<p><strong>重要：</strong></p>
<p><strong>Spring 中文文档地址：</strong> <a href="https://www.docs4dev.com/docs/zh/spring-framework/5.1.3.RELEASE/reference/overview.html#overview-feedback" target="_blank" rel="noopener">https://www.docs4dev.com/docs/zh/spring-framework/5.1.3.RELEASE/reference/overview.html#overview-feedback</a></p>
<p><strong>Spring 英文文档地址</strong>：<a href="https://docs.spring.io/spring-framework/docs/current/reference/html/core.html#beans" target="_blank" rel="noopener">https://docs.spring.io/spring-framework/docs/current/reference/html/core.html#beans</a></p>
<a id="more"></a>



<p><strong>优点：</strong></p>
<ul>
<li><strong>控制反转IOC</strong></li>
<li><strong>面向切面编程AOP</strong></li>
<li><strong>对事务的支持，对框架的支持</strong></li>
<li><strong>Spring是一个轻量级框架，非侵入式</strong></li>
</ul>
<p><strong>一句话概括：</strong></p>
<p><strong>Spring是一个轻量级的控制反转(IoC)和面向切面(AOP)的容器（框架）。</strong></p>
<h3 id="1-1-组成"><a href="#1-1-组成" class="headerlink" title="1.1 组成"></a>1.1 组成</h3><p><img src="https://zhuuu-bucket.oss-cn-beijing.aliyuncs.com/img/20200323110430.png" alt=""></p>
<p>Spring 框架是一个分层架构，由 7 个定义良好的模块组成。Spring 模块构建在核心容器之上，核心容器定义了创建、配置和管理 bean 的方式 .</p>
<p>组成 Spring 框架的每个模块（或组件）都可以单独存在，或者与其他一个或多个模块联合实现。每个模块的功能如下：</p>
<ul>
<li><strong>核心容器</strong>：核心容器提供 Spring 框架的基本功能。核<strong>心容器的主要组件是<code>BeanFactory</code>，它是工厂模式的实现。</strong>BeanFactory 使用<em>控制反转</em>（IOC） 模式将应用程序的配置和依赖性规范与实际的应用程序代码分开。</li>
<li><strong>Spring 上下文</strong>：Spring 上下文是一个配置文件，向 Spring 框架提供上下文信息。<strong>Spring 上下文包括企业服务，例如 JNDI、EJB、电子邮件、国际化、校验和调度功能。</strong></li>
<li><strong>Spring AOP</strong>：通过配置管理特性，Spring AOP 模块直接将面向切面的编程功能 , 集成到了 Spring 框架中。所以，可以很容易地使 Spring 框架管理任何支持 AOP的对象。<strong>Spring AOP 模块为基于 Spring 的应用程序中的对象提供了事务管理服务。通过使用 Spring AOP，不用依赖组件，就可以将声明性事务管理集成到应用程序中。</strong></li>
<li><strong>Spring DAO</strong>：<code>JDBC DAO</code>抽象层提供了有意义的异常层次结构，可用该结构来管理异常处理和不同数据库供应商抛出的错误消息。<strong>异常层次结构简化了错误处理，并且极大地降低了需要编写的异常代码数量（例如打开和关闭连接）。</strong>Spring DAO 的面向 JDBC 的异常遵从通用的 DAO 异常层次结构。</li>
<li><strong>Spring ORM</strong>：<strong>Spring 框架插入了若干个 ORM 框架，从而提供了 ORM 的对象关系工具</strong>，其中包括 JDO、Hibernate 和 iBatis SQL Map。所有这些都遵从 Spring 的通用事务和 DAO 异常层次结构。</li>
<li><strong>Spring Web 模块</strong>：Web 上下文模块建立在应用程序上下文模块之上，为基于 Web 的应用程序提供了上下文。所以，Spring 框架支持与 Jakarta Struts 的集成。Web 模块还简化了处理多部分请求以及将请求参数绑定到域对象的工作。</li>
<li><strong>Spring MVC 框架</strong>：<strong>MVC 框架是一个全功能的构建 Web 应用程序的 MVC 实现。</strong>通过策略接口，MVC 框架变成为高度可配置的，MVC 容纳了大量视图技术，其中包括 JSP、Velocity、Tiles、iText 和 POI。</li>
</ul>
<p><strong>Spring 官网描述</strong></p>
<ul>
<li>Spring 框架分为多个模块。应用程序可以选择所需的模块。</li>
<li><strong>核心容器的模块是核心，包括配置模型和依赖项注入机制</strong>。</li>
<li>除此之外，Spring 框架为不同的应用程序体系结构提供了基础支持，包括<strong>消息传递，事务性数据和持久性以及 Web。</strong>它还包括基于 Servlet 的 Spring MVC Web 框架，以及并行的 Spring WebFlux 反应式 Web 框架。</li>
</ul>
<h2 id="2-IOC理论推导"><a href="#2-IOC理论推导" class="headerlink" title="2. IOC理论推导"></a>2. IOC理论推导</h2><h3 id="2-1-推导"><a href="#2-1-推导" class="headerlink" title="2.1 推导"></a>2.1 推导</h3><p>考虑如下一种情形：</p>
<ol>
<li><code>UserDao.inteface</code></li>
</ol>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.zhuuu.dao;</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">UserDao</span> </span>&#123;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">getUser</span><span class="params">()</span></span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>



<ol start="2">
<li><code>UserDaoImpl.java</code></li>
</ol>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.zhuuu.dao;</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">UserDaoImpl</span> <span class="keyword">implements</span> <span class="title">UserDao</span></span>&#123;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">getUser</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        System.out.println(<span class="string">"获取用户数据"</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>



<ol start="3">
<li><code>UserService.inteface</code></li>
</ol>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.zhuuu.Service;</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">UserService</span> </span>&#123;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">getUser</span><span class="params">()</span></span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>



<ol start="4">
<li><code>UserServiceImpl.java</code></li>
</ol>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">UserServiceImpl</span> <span class="keyword">implements</span> <span class="title">UserService</span> </span>&#123;</span><br><span class="line">    <span class="comment">// 组合的概念</span></span><br><span class="line">    <span class="keyword">private</span> UserDao userDao = <span class="keyword">new</span> UserDaoImpl();</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">getUser</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="comment">// 真正其实是调用dao层</span></span><br><span class="line">        userDao.getUser();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>



<p><strong>测试一下：</strong></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">test</span><span class="params">()</span></span>&#123;</span><br><span class="line">   <span class="comment">// 用户实际调用的是业务层,dao 层他们不需要接触！</span></span><br><span class="line">   UserService service = <span class="keyword">new</span> UserServiceImpl();</span><br><span class="line">   service.getUser();</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>



<p><strong>那么现在问题来了，如果用户想添加新的功能，那么我们只能从Service层Impl去修改代码</strong></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">UserServiceImpl</span> <span class="keyword">implements</span> <span class="title">UserService</span> </span>&#123;</span><br><span class="line">   <span class="keyword">private</span> UserDao userDao = <span class="keyword">new</span> UserDaoMySqlImpl();</span><br><span class="line"></span><br><span class="line">   <span class="meta">@Override</span></span><br><span class="line">   <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">getUser</span><span class="params">()</span> </span>&#123;</span><br><span class="line">       userDao.getUser();</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p><strong>假设如果我们还要新增一个功能的话，如</strong></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.zhuuu.dao;</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">UserDaoOracleImpl</span> <span class="keyword">implements</span> <span class="title">UserDao</span> </span>&#123;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">getUser</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        System.out.println(<span class="string">"Oracle获取数据"</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>



<ul>
<li>那么我们发现了一个很严重的问题，程序的耦合性太高了，牵一发而动全身。</li>
<li>假设我们的这种需求非常大 , 这种方式就根本不适用了</li>
</ul>
<p><strong>那么我们如何解决呢？</strong></p>
<h3 id="2-2-推导结果"><a href="#2-2-推导结果" class="headerlink" title="2.2 推导结果"></a>2.2 推导结果</h3><ul>
<li>我们可以在需要用到它的地方，<strong>不去实现它，而是留出一个接口</strong></li>
<li><strong>通过set方法去引用注入</strong></li>
</ul>
<ol>
<li>修改过的<code>UserServiceImpl.java</code></li>
</ol>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">UserServiceImpl</span> <span class="keyword">implements</span> <span class="title">UserService</span> </span>&#123;</span><br><span class="line"><span class="comment">//    private UserDao userDao = new UserDaoImpl();</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">     * 方式二 ：利用接口实现类(set方法)</span></span><br><span class="line"><span class="comment">     */</span></span><br><span class="line">    <span class="keyword">private</span> UserDao userDao;</span><br><span class="line"></span><br><span class="line">    <span class="comment">// 利用set进行动态实现值的注入</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">setUserDao</span><span class="params">(UserDao userDao)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">this</span>.userDao = userDao;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">getUser</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="comment">// 真正其实是调用dao层</span></span><br><span class="line">        <span class="comment">// 用户实际调用的是业务层,dao 层他们不需要接触！</span></span><br><span class="line">        userDao.getUser();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>



<ol start="2">
<li><strong>现在通过不一样的的方法去测试</strong></li>
</ol>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">test</span><span class="params">()</span></span>&#123;</span><br><span class="line">   UserServiceImpl service = <span class="keyword">new</span> UserServiceImpl();</span><br><span class="line">   service.setUserDao( <span class="keyword">new</span> UserDaoMySqlImpl() );</span><br><span class="line">   service.getUser();</span><br><span class="line">   <span class="comment">//那我们现在又想用Oracle去实现呢</span></span><br><span class="line">   service.setUserDao( <span class="keyword">new</span> UserDaoOracleImpl() );</span><br><span class="line">   service.getUser();</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>



<p><strong>注意：这里已经发生了根本性的变化</strong></p>
<ul>
<li><strong>以前所有的东西都是由程序去进行控制创建</strong></li>
<li><strong>而现在是由用户进行控制创建，把主动权交给了调用者，程序不要用管怎么创建对象。</strong></li>
<li><strong>这种思想 , 从本质上解决了问题 , 我们程序员不再去管理对象的创建了 , 更多的去关注业务的实现 . 耦合性大大降低 . 这也就是IOC的原型 !</strong></li>
</ul>
<h3 id="2-3-IOC本质"><a href="#2-3-IOC本质" class="headerlink" title="2.3 IOC本质"></a>2.3 IOC本质</h3><p><strong>控制反转IOC(Inversion Of Control)</strong></p>
<ul>
<li>一种设计思想，<strong>DI(依赖注入)是实现IoC的一种方法</strong>，也有人认为DI只是IoC的另一种说法</li>
<li>没有IoC的程序中 , 我们使用面向对象编程，对象的创建与对象间的依赖关系完全在硬编码的程序中</li>
<li>控制反转后将对象的创建交给第三方（可以说是获取依赖对象的方式反转了）</li>
</ul>
<p><img src="http://zhuuu-bucket.oss-cn-beijing.aliyuncs.com/img/20200509/180313492.png" alt="mark"></p>
<p><img src="http://zhuuu-bucket.oss-cn-beijing.aliyuncs.com/img/20200509/180325441.png" alt="mark"></p>
<p>以上就是<code>IOC</code>带来的改变。</p>
<p>同时，在Spring中：</p>
<ul>
<li><p><strong>IoC是Spring框架的核心内容</strong>，使用多种方式完美的实现了IoC，可以使用XML配置，也可以使用注解，新版本的Spring也可以零配置实现IoC。</p>
</li>
<li><p><strong>Spring容器在初始化的时候先读取配置文件，根据配置文件或元数据创建与组织对象存入容器中，程序使用时再去从IOC容器中读取需要的对象。</strong></p>
</li>
</ul>
<p><img src="http://zhuuu-bucket.oss-cn-beijing.aliyuncs.com/img/20200509/180605099.png" alt="mark"></p>
<p><strong>在Spring中实现控制反转的是IoC容器，其实现方法是依赖注入（Dependency Injection,DI）。</strong></p>
<p><img src="http://zhuuu-bucket.oss-cn-beijing.aliyuncs.com/img/20201111/165304637.png" alt="mark"></p>

      
      <!-- reward -->
      
      <div id="reward-btn">
        打赏
      </div>
      
    </div>
      <!-- copyright -->
      
        <div class="declare">
          <ul class="post-copyright">
            <li>
              <i class="ri-copyright-line"></i>
              <strong>版权声明： </strong s>
              本博客所有文章除特别声明外，均采用 <a href="https://www.apache.org/licenses/LICENSE-2.0.html" rel="external nofollow"
                target="_blank">Apache License 2.0</a> 许可协议。转载请注明出处！
            </li>
          </ul>
        </div>
        
    <footer class="article-footer">
      
          
<div class="share-btn">
      <span class="share-sns share-outer">
        <i class="ri-share-forward-line"></i>
        分享
      </span>
      <div class="share-wrap">
        <i class="arrow"></i>
        <div class="share-icons">
          
          <a class="weibo share-sns" href="javascript:;" data-type="weibo">
            <i class="ri-weibo-fill"></i>
          </a>
          <a class="weixin share-sns wxFab" href="javascript:;" data-type="weixin">
            <i class="ri-wechat-fill"></i>
          </a>
          <a class="qq share-sns" href="javascript:;" data-type="qq">
            <i class="ri-qq-fill"></i>
          </a>
          <a class="douban share-sns" href="javascript:;" data-type="douban">
            <i class="ri-douban-line"></i>
          </a>
          <!-- <a class="qzone share-sns" href="javascript:;" data-type="qzone">
            <i class="icon icon-qzone"></i>
          </a> -->
          
          <a class="facebook share-sns" href="javascript:;" data-type="facebook">
            <i class="ri-facebook-circle-fill"></i>
          </a>
          <a class="twitter share-sns" href="javascript:;" data-type="twitter">
            <i class="ri-twitter-fill"></i>
          </a>
          <a class="google share-sns" href="javascript:;" data-type="google">
            <i class="ri-google-fill"></i>
          </a>
        </div>
      </div>
</div>

<div class="wx-share-modal">
    <a class="modal-close" href="javascript:;"><i class="ri-close-circle-line"></i></a>
    <p>扫一扫，分享到微信</p>
    <div class="wx-qrcode">
      <img src="//api.qrserver.com/v1/create-qr-code/?size=150x150&data=http://zhuuu.work/2020/05/01/Spring/Spring-01-%E6%A6%82%E8%BF%B0%E5%8F%8AIOC%E7%90%86%E8%AE%BA%E6%8E%A8%E5%AF%BC/" alt="微信分享二维码">
    </div>
</div>

<div id="share-mask"></div>
      
      
  <ul class="article-tag-list" itemprop="keywords"><li class="article-tag-list-item"><a class="article-tag-list-link" href="/tags/Spring/" rel="tag">Spring</a></li></ul>


    </footer>

  </div>

  
  
  <nav class="article-nav">
    
      <a href="/2020/05/01/Leetcode/Leetcode-213-%E6%89%93%E5%AE%B6%E5%8A%AB%E8%88%8DII/" class="article-nav-link">
        <strong class="article-nav-caption">上一篇</strong>
        <div class="article-nav-title">
          
            Leetcode-213-打家劫舍II
          
        </div>
      </a>
    
    
      <a href="/2020/05/01/FileIO/IO-02-%E6%B5%81%E7%9A%84%E5%88%86%E7%B1%BB/" class="article-nav-link">
        <strong class="article-nav-caption">下一篇</strong>
        <div class="article-nav-title">IO-02-流的分类</div>
      </a>
    
  </nav>


  

  
  
<!-- valine评论 -->
<div id="vcomments-box">
    <div id="vcomments">
    </div>
</div>
<script src="//cdn1.lncld.net/static/js/3.0.4/av-min.js"></script>
<script src='https://cdn.jsdelivr.net/npm/valine@1.3.10/dist/Valine.min.js'></script>
<script>
    new Valine({
        el: '#vcomments',
        notify: false,
        verify: '',
        app_id: '',
        app_key: '',
        path: window.location.pathname,
        avatar: 'mp',
        placeholder: '给我的文章加点评论吧~',
        recordIP: true
    });
    const infoEle = document.querySelector('#vcomments .info');
    if (infoEle && infoEle.childNodes && infoEle.childNodes.length > 0) {
        infoEle.childNodes.forEach(function (item) {
            item.parentNode.removeChild(item);
        });
    }
</script>
<style>
    #vcomments-box {
        padding: 5px 30px;
    }

    @media screen and (max-width: 800px) {
        #vcomments-box {
            padding: 5px 0px;
        }
    }

    #vcomments-box #vcomments {
        background-color: #fff;
    }

    .v .vlist .vcard .vh {
        padding-right: 20px;
    }

    .v .vlist .vcard {
        padding-left: 10px;
    }
</style>

  

  
  
<div class="gitalk" id="gitalk-container"></div>

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/gitalk@1.5.0/dist/gitalk.css">


<script src="https://cdn.jsdelivr.net/npm/gitalk@1.5.0/dist/gitalk.min.js"></script>


<script src="https://cdn.jsdelivr.net/npm/blueimp-md5@2.10.0/js/md5.min.js"></script>

<script type="text/javascript">
  var gitalk = new Gitalk({
    clientID: 'db188ed8c86dc4b0dbf3',
    clientSecret: 'a58f92160e5a9efd726b7d533000a0737f3e3f3e',
    repo: 'Blog-comments',
    owner: 'Zhuuuuuuuu',
    admin: ['Zhuuuuuuuu'],
    // id: location.pathname,      // Ensure uniqueness and length less than 50
    id: md5(location.pathname),
    distractionFreeMode: false,  // Facebook-like distraction free mode
    pagerDirection: 'last'
  })

  gitalk.render('gitalk-container')
</script>

  

</article>
</section>
      <footer class="footer">
  <div class="outer">
    <ul class="list-inline">
      <li>
        &copy;
        2019-2021
        Zhuuu
      </li>
      <li>
        
      </li>
    </ul>
    <ul class="list-inline">
      <li>
        
        
        <span>
  <i>PV:<span id="busuanzi_value_page_pv"></span></i>
  <i>UV:<span id="busuanzi_value_site_uv"></span></i>
</span>
        
      </li>
      <li>
        <!-- cnzz统计 -->
        
        <script type="text/javascript" src='https://s9.cnzz.com/z_stat.php?id=1278069914&amp;web_id=1278069914'></script>
        
      </li>
    </ul>
  </div>
</footer>
    <div class="to_top">
        <div class="totop" id="totop">
  <i class="ri-arrow-up-line"></i>
</div>
      </div>
    </main>
      <aside class="sidebar">
        <button class="navbar-toggle"></button>
<nav class="navbar">
  
  <div class="logo">
    <a href="/"><img src="/images/ayer-side.svg" alt="朱酱酱的学习博客"></a>
  </div>
  
  <ul class="nav nav-main">
    
    <li class="nav-item">
      <a class="nav-item-link" href="/">主页</a>
    </li>
    
    <li class="nav-item">
      <a class="nav-item-link" href="/tags">标签</a>
    </li>
    
    <li class="nav-item">
      <a class="nav-item-link" href="/tags/JVM/">JVM</a>
    </li>
    
    <li class="nav-item">
      <a class="nav-item-link" href="/tags/JDK%E6%BA%90%E7%A0%81%E5%88%86%E6%9E%90/">JDK源码</a>
    </li>
    
    <li class="nav-item">
      <a class="nav-item-link" href="/tags/%E5%A4%9A%E7%BA%BF%E7%A8%8B/">多线程</a>
    </li>
    
    <li class="nav-item">
      <a class="nav-item-link" href="/tags/Mysql/">Mysql</a>
    </li>
    
    <li class="nav-item">
      <a class="nav-item-link" href="/tags/Redis/">Redis</a>
    </li>
    
    <li class="nav-item">
      <a class="nav-item-link" href="/tags/%E8%AE%BE%E8%AE%A1%E8%80%85%E6%A8%A1%E5%BC%8F/">设计模式</a>
    </li>
    
    <li class="nav-item">
      <a class="nav-item-link" href="/tags/MyBatis/">MyBatis</a>
    </li>
    
    <li class="nav-item">
      <a class="nav-item-link" href="/tags/SpringMVC/">SpringMVC</a>
    </li>
    
    <li class="nav-item">
      <a class="nav-item-link" href="/tags/Spring/">Spring</a>
    </li>
    
    <li class="nav-item">
      <a class="nav-item-link" href="/tags/SpringBoot/">SpringBoot</a>
    </li>
    
    <li class="nav-item">
      <a class="nav-item-link" href="/tags/%E6%93%8D%E4%BD%9C%E7%B3%BB%E7%BB%9F/">Linux</a>
    </li>
    
    <li class="nav-item">
      <a class="nav-item-link" href="/tags/Leetcode/">Leetcode</a>
    </li>
    
    <li class="nav-item">
      <a class="nav-item-link" href="/tags/%E5%89%8D%E7%AB%AF/">前端</a>
    </li>
    
    <li class="nav-item">
      <a class="nav-item-link" href="/tags/%E7%BD%91%E7%BB%9C%E7%BC%96%E7%A8%8B/">网络编程</a>
    </li>
    
    <li class="nav-item">
      <a class="nav-item-link" href="/tags/photoshop/">photoshop</a>
    </li>
    
    <li class="nav-item">
      <a class="nav-item-link" href="http://smartzhuuu.lofter.com/" target="_blank" rel="noopener">摄影</a>
    </li>
    
    <li class="nav-item">
      <a class="nav-item-link" href="/2020/about">关于我</a>
    </li>
    
  </ul>
</nav>
<nav class="navbar navbar-bottom">
  <ul class="nav">
    <li class="nav-item">
      
      <a class="nav-item-link nav-item-search"  title="Search">
        <i class="ri-search-line"></i>
      </a>
      
      
      <a class="nav-item-link" target="_blank" href="/atom.xml" title="RSS Feed">
        <i class="ri-rss-line"></i>
      </a>
      
    </li>
  </ul>
</nav>
<div class="search-form-wrap">
  <div class="local-search local-search-plugin">
  <input type="search" id="local-search-input" class="local-search-input" placeholder="Search...">
  <div id="local-search-result" class="local-search-result"></div>
</div>
</div>
      </aside>
      <div id="mask"></div>

<!-- #reward -->
<div id="reward">
  <span class="close"><i class="ri-close-line"></i></span>
  <p class="reward-p"><i class="ri-cup-line"></i>请我喝杯咖啡吧~</p>
  <div class="reward-box">
    
    <div class="reward-item">
      <img class="reward-img" src="/images/alipay.jpg">
      <span class="reward-type">支付宝</span>
    </div>
    
    
    <div class="reward-item">
      <img class="reward-img" src="/images/wechat.jpg">
      <span class="reward-type">微信</span>
    </div>
    
  </div>
</div>
      
<script src="/js/jquery-2.0.3.min.js"></script>


<script src="/js/jquery.justifiedGallery.min.js"></script>


<script src="/js/lazyload.min.js"></script>


<script src="/js/busuanzi-2.3.pure.min.js"></script>


<script src="/js/share.js"></script>



<script src="/fancybox/jquery.fancybox.min.js"></script>




<script>
  try {
    var typed = new Typed("#subtitle", {
    strings: ['昨夜西风凋碧树。独上高楼，望尽天涯路','衣带渐宽终不悔，为伊消得人憔悴。','众里寻他千百度。蓦然回首，那人却在，灯火阑珊处。'],
    startDelay: 0,
    typeSpeed: 200,
    loop: true,
    backSpeed: 100,
    showCursor: true
    });
  } catch (err) {
  }
  
</script>




<script src="/js/tocbot.min.js"></script>

<script>
  // Tocbot_v4.7.0  http://tscanlin.github.io/tocbot/
  tocbot.init({
    tocSelector: '.tocbot',
    contentSelector: '.article-entry',
    headingSelector: 'h1, h2, h3, h4, h5, h6',
    hasInnerContainers: true,
    scrollSmooth: true,
    scrollContainer:'main',
    positionFixedSelector: '.tocbot',
    positionFixedClass: 'is-position-fixed',
    fixedSidebarOffset: 'auto',
    onClick: (e) => {
      $('.toc-link').removeClass('is-active-link');
      $(`a[href=${e.target.hash}]`).addClass('is-active-link');
      $(e.target.hash).scrollIntoView();
      return false;
    }
  });
</script>


<script>
  var ayerConfig = {
    mathjax: true
  }
</script>


<script src="/js/ayer.js"></script>


<script src="https://cdn.jsdelivr.net/npm/jquery-modal@0.9.2/jquery.modal.min.js"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/jquery-modal@0.9.2/jquery.modal.min.css">


<!-- Root element of PhotoSwipe. Must have class pswp. -->
<div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">

    <!-- Background of PhotoSwipe. 
         It's a separate element as animating opacity is faster than rgba(). -->
    <div class="pswp__bg"></div>

    <!-- Slides wrapper with overflow:hidden. -->
    <div class="pswp__scroll-wrap">

        <!-- Container that holds slides. 
            PhotoSwipe keeps only 3 of them in the DOM to save memory.
            Don't modify these 3 pswp__item elements, data is added later on. -->
        <div class="pswp__container">
            <div class="pswp__item"></div>
            <div class="pswp__item"></div>
            <div class="pswp__item"></div>
        </div>

        <!-- Default (PhotoSwipeUI_Default) interface on top of sliding area. Can be changed. -->
        <div class="pswp__ui pswp__ui--hidden">

            <div class="pswp__top-bar">

                <!--  Controls are self-explanatory. Order can be changed. -->

                <div class="pswp__counter"></div>

                <button class="pswp__button pswp__button--close" title="Close (Esc)"></button>

                <button class="pswp__button pswp__button--share" style="display:none" title="Share"></button>

                <button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>

                <button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>

                <!-- Preloader demo http://codepen.io/dimsemenov/pen/yyBWoR -->
                <!-- element will get class pswp__preloader--active when preloader is running -->
                <div class="pswp__preloader">
                    <div class="pswp__preloader__icn">
                        <div class="pswp__preloader__cut">
                            <div class="pswp__preloader__donut"></div>
                        </div>
                    </div>
                </div>
            </div>

            <div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
                <div class="pswp__share-tooltip"></div>
            </div>

            <button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
            </button>

            <button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
            </button>

            <div class="pswp__caption">
                <div class="pswp__caption__center"></div>
            </div>

        </div>

    </div>

</div>

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe.min.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/default-skin/default-skin.css">
<script src="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe-ui-default.min.js"></script>

<script>
    function viewer_init() {
        let pswpElement = document.querySelectorAll('.pswp')[0];
        let $imgArr = document.querySelectorAll(('.article-entry img:not(.reward-img)'))

        $imgArr.forEach(($em, i) => {
            $em.onclick = () => {
                // slider展开状态
                // todo: 这样不好，后面改成状态
                if (document.querySelector('.left-col.show')) return
                let items = []
                $imgArr.forEach(($em2, i2) => {
                    let img = $em2.getAttribute('data-idx', i2)
                    let src = $em2.getAttribute('data-target') || $em2.getAttribute('src')
                    let title = $em2.getAttribute('alt')
                    // 获得原图尺寸
                    const image = new Image()
                    image.src = src
                    items.push({
                        src: src,
                        w: image.width || $em2.width,
                        h: image.height || $em2.height,
                        title: title
                    })
                })
                var gallery = new PhotoSwipe(pswpElement, PhotoSwipeUI_Default, items, {
                    index: parseInt(i)
                });
                gallery.init()
            }
        })
    }
    viewer_init()
</script>



<script type="text/x-mathjax-config">
  MathJax.Hub.Config({
      tex2jax: {
          inlineMath: [ ['$','$'], ["\\(","\\)"]  ],
          processEscapes: true,
          skipTags: ['script', 'noscript', 'style', 'textarea', 'pre', 'code']
      }
  });

  MathJax.Hub.Queue(function() {
      var all = MathJax.Hub.getAllJax(), i;
      for(i=0; i < all.length; i += 1) {
          all[i].SourceElement().parentNode.className += ' has-jax';
      }
  });
</script>

<script src="https://cdn.jsdelivr.net/npm/mathjax@2.7.6/unpacked/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>


<script type="text/javascript" src="https://js.users.51.la/20544303.js"></script>
  </div>
</body>

</html>